After the impressive debut of a new retractable roof over Arthur Ashe Stadium, there is one thing on every tennis fan’s mind: the U.S. Open. Serena Williams will compete in the tournament where she is not only ranked No. 1, but also chases a record 23rd Grand Slam title. Will Williams remain atop her throne? Or will a new generation of American tennis prodigies take over?

Despite falling short in the Rio Olympics this summer, Williams is sure to deliver an exciting match. Williams is currently recovering from a shoulder injury that inhibited her participation in the Western & Southern Open in Cincinnati in August. Her performance in the U.S. Open will be very telling as to whether she has fully recovered from her injury and can reassure her position as No. 1 in the world.

The U.S. Open is the fourth and last Grand Slam tournament of the year where the best of the best compete in their final annual matches. It began in 1881 as the U.S. National Championship and was held at the Newport Casino in Newport, R.I. Over a century later, this same prestigious tournament continues in a different location.

In 1997, Arthur Ashe Stadium was constructed and became the world’s largest tennis-specific stadium. To better envision its monumental size, every University student could fit in the stadium—six times over. Over the years, the U.S. Open has been played on three different surfaces: grass, clay, and hard court. Only one man, Jimmy Connors, has won on all three surfaces.

With so much on the line for Williams and so many traditions that have gone on to enrich the world of tennis, this year’s U.S. Open is sure to entertain as well as mark its place in history.